Check for a earth connection in both the socket and plug
SOURCE: 2006 dodge ram 2500 a/c fuse rely
The AC relay is located in the under hood fuse box. The cover should have a legend for location. Its one of the bigger black ones. You can rotate it with the horn or ABS one to see if its the problem. You may have a small fuse also in that box for it. If this doesn't solve the problem then you either have a leak or a computer problem. What a shop will do is try with a bidirectional data scanner turn the AC on. If they can't get it to turn on with a scanner then you most likely have a failed PCM if they verified you do not have low pressure or a relay or wiring or switch issue.
SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK
I'd get a 12vdc test light if you don't have one already & start from plug, and keep probing back from there. It may be as simple as a bad connection under truck where joined into harness.
SOURCE: dodge ram 1500 the radio and dash lights are not working
did u look at the fuses under the hood there might be one there other than that sounds like you wiring went bad or the part of your switch is bad replace the switch
SOURCE: The reverse lights will not come on on my 2006
The actual reverse switch that controls the lights will be located on the side of your transmission and will have a couple of wires coming out of it. Odds are the switch has gone bad as it's exposed
SOURCE: 2006 Dodge Ram 2500 diesel truck----need inside fuse box diagram
If you are looking for the fuse box diagrams or any other diagrams for your Ram, check promanuals.net for a factory service manual for around 20 bucks or so. It's an invaluable tool for my Ram 2500.
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